1 Answer
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When I attached a screen to the onboard adapter (which I usally don't use), I noticed that the screen was actually not staying blank, but Debian used the internal graphics to display a boot error - even when I set "Initiate Graphic Adapter" to PCIE/PCI instead of iGPU (internal).

I get two different errors, which also seems to be kind of random. Mostly I get this error:

And sometimes it already freezes at Waiting for /dev to be fully populated.

I tried to disable the onboard bluetooth adapter, but I still got the black screen error from time to time.

Next I saw that the Bios allows to run both internal and external graphics together - the related setting is Advanced/System Agent Configuration/iGPU Multi-Monitor.
I disabled that setting. Now I don't get the blank screen error anymore.

I could not find a better place where to post this problem (and its solution), but I just wanted it to be somewhere on the net, maybe it helps some poor guy out there with a similar configuration. Should I post this on any mailing list or something similar - could this info be useful to some developers? If yes, where should I post this?
–
ifischerApr 22 '13 at 21:39

Thanks a lot! This worked very well for me too. Approximately same setup but I'm using the properitary amd drivers.
–
Magnus WinterOct 10 '13 at 8:56